中间柱摩擦阻尼器预应力钢框架静力推覆试验研究

为研究跨度较大的预应力钢框架结构的可恢复功能，提出了具有可恢复功能的中间柱设有摩擦阻尼器的预应力钢框架体系，给出了中间柱摩擦阻尼器的典型构造。设计了一个8层原型结构，对底部两层平面框架子结构进行了静力推覆试验，同时采用ABAQUS有限元软件对试验进行了数值模拟。结果表明：中间柱的摩擦阻尼器在提高框架结构刚度的同时，还提高了结构的耗能能力；结构除梁翼缘加强板和柱脚翼缘出现塑性变形以外，其他主体结构始终保持弹性工作状态；第1、2层框架的层间剪力 位移滞回模型分别呈梭形和弓形。卸载后的检测结果显示，钢绞线的预应力损失很小，为结构提供了良好的自动复位和恢复结构功能的能力。

Static pushover test on resilient prestressed steel framewith intermediate column containing friction dampers

The structural system of the resilient prestressed steel frame with intermediate column containing friction damper and the typical details of the intermediate column containing friction dissipation damper were put forward for researching the resilient capacity to large-span prestressed steel structures. An eight-story prototype structure was designed and a static pushover test of the first two-story plane frame was conducted. The numerical simulation was also carried out by using the software ABAQUS. The results show that, the intermediate column containing friction dampers increases not only the structural rigidity but also the energy dissipation capacity. The main structure still remains elastic except the reinforcing plate of beam flange and web plate of column foot. The story shear force-displacement hysteresis model of the two-story plane steel frame was acquired by the pushover test, and the hysteresis models of story 1 and story 2 exhibited shuttle shape and arc shape respectively, which is the basis of further study on the mechanical performance of the structural system. The loss of prestressing steel strand force is very little after the test and can provide an excellent self-centering mechanism and capacity of resilient structure function.